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  2. C date and time functions - Wikipedia

    en.wikipedia.org/wiki/C_date_and_time_functions

    The C date and time operations are defined in the time.h header file (ctime header in C++). returns the current time of the system as a time_t value, number of seconds, (which is usually time since an epoch, typically the Unix epoch). The value of the epoch is operating system dependent; 1900 and 1970 are often used. See RFC 868.

  3. Epoch (computing) - Wikipedia

    en.wikipedia.org/wiki/Epoch_(computing)

    In computing, an epoch is a fixed date and time used as a reference from which a computer measures system time. Most computer systems determine time as a number representing the seconds removed from a particular arbitrary date and time. For instance, Unix and POSIX measure time as the number of seconds that have passed since Thursday 1 January ...

  4. System time - Wikipedia

    en.wikipedia.org/wiki/System_time

    Unix date command. In computer science and computer programming, system time represents a computer system's notion of the passage of time. In this sense, time also includes the passing of days on the calendar. System time is measured by a system clock, which is typically implemented as a simple count of the number of ticks that have transpired ...

  5. Unix time - Wikipedia

    en.wikipedia.org/wiki/Unix_time

    Unix time[a] is a date and time representation widely used in computing. It measures time by the number of non- leap seconds that have elapsed since 00:00:00 UTC on 1 January 1970, the Unix epoch. In modern computing, values are sometimes stored with higher granularity, such as microseconds or nanoseconds.

  6. Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Excel

    Microsoft Excel is a spreadsheet editor developed by Microsoft for Windows, macOS, Android, iOS and iPadOS. It features calculation or computation capabilities, graphing tools, pivot tables, and a macro programming language called Visual Basic for Applications (VBA). Excel forms part of the Microsoft 365 suite of software.

  7. Virtual method table - Wikipedia

    en.wikipedia.org/wiki/Virtual_method_table

    In computer programming, a virtual method table (VMT), virtual function table, virtual call table, dispatch table, vtable, or vftable is a mechanism used in a programming language to support dynamic dispatch (or run-time method binding). Whenever a class defines a virtual function (or method), most compilers add a hidden member variable to the ...

  8. Functional programming - Wikipedia

    en.wikipedia.org/wiki/Functional_programming

    Functional programming. In computer science, functional programming is a programming paradigm where programs are constructed by applying and composing functions. It is a declarative programming paradigm in which function definitions are trees of expressions that map values to other values, rather than a sequence of imperative statements which ...

  9. Function (computer programming) - Wikipedia

    en.wikipedia.org/wiki/Function_(computer...

    In computer programming, a function (also procedure, method, subroutine, routine, or subprogram) is a callable unit[ 1 ] of software logic that has a well-defined interface and behavior and can be invoked multiple times. Callable units provide a powerful programming tool. [ 2 ] The primary purpose is to allow for the decomposition of a large ...